/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022-03-10
 * Description: Student class
 */

public class Student {

    /*
     * Student's ID number
     */
    private int ID;

    /*
     * whether the student is currently sleeping or not, default is false
     */
    private boolean sleeping;

    /**
     * Constructor. Initialize the ID number and sleeping status as false.
     * 
     * @param ID, the ID number of the student
     */
    public Student(int ID) {
        this.ID = ID;
        this.sleeping = false;
    }

    /**
     * Getter of the ID number.
     *
     * @return the ID number of the student
     */
    public int getID() {
        return this.ID;
    }

    /**
     * Identify whether the student is sleeping or not.
     *
     * @return true if the student is sleeping, false otherwise
     */
    public boolean isSleeping() {
        return this.sleeping;
    }

    /**
     * Make the student fall in sleep.
     *
     * @return void
     */
    public void fallAsleep() {
        this.sleeping = true;
    }

    /**
     * Walkup the student.
     *
     * @return void
     */
    public void wakeUp() {
        this.sleeping = false;
    }

    /**
     * Test student class.
     */
    public static void testStudent() {
        Student s = new Student(1234567890);

        System.out.println(s.getID() == 1234567890);
        System.out.println(s.isSleeping() == false);
        s.fallAsleep();
        System.out.println(s.isSleeping() == true);
        s.fallAsleep();
        System.out.println(s.isSleeping() == true);
        s.wakeUp();
        System.out.println(s.isSleeping() == false);
        s.wakeUp();
        System.out.println(s.isSleeping() == false);
    }
}